7424 research outputs found
Sort by
Comparative Analysis of Grid Following and Grid Forming Inverter Models for Studying Low Inertia Power System and Its Performance Test in Weak Grid using PMView
Get PDFThis thesis explores the importance of inertia in the power grid traditionally provided by the rotating machines and as the penetration of the Inverter Based Resources (IBRs) increases in the grid, it brings new obstacles regarding grid reliability and stability. An advanced form of inverter (Grid-Forming type) has been compared with the conventional inverter type (Grid-Following) in an Electromagnetic Transient Software (PSCAD) under three scenarios where the system’s inertia is reduced to 50%, 25%, and 12.5%, with faults applied at three different locations: PV Point of Interconnection (POI), one bus away from PV POI, and the synchronous generator bus. Furthermore, the GFL and GFM inverters are compared in a test system set-up using PMView, an IBR model review platform developed by ERCOT, in low Short Circuit Ratio (SCR) systems in which the SCR value is gradually decreased from a value of 10 up to an SCR value of 1.5. The results indicate that the GFM inverter model offers a faster fault recovery response with better system performance in low inertia power system. It is also observed that while the GFL inverter model is stable up to an SCR value to 2.5, the GFM model performs well even at a low SCR value of 1.5
Advancing Sustainability in Transportation Systems: A Bibliometric Analysis and Development of a Prioritization Index
Get PDFThis research has three main objectives. First, a bibliometric analysis of the existing literature on the sustainability of transportation systems is conducted. Second, a unified framework is proposed to assess the sustainability of transportation systems from United States (U.S.), non-U.S., and global perspectives. Third, a Sustainability-driven Prioritization Index (SPI) is developed, which comprehensively incorporates sustainability metrics and factors to prioritize projects across different contexts. In this research, the distribution of publications by type, publication trends over years, categorization of topics, keyword co-occurrence patterns, and citation trends are examined. A comprehensive literature review identified 55 factors across five sustainability metrics: environment, economy, society, transportation, and safety. A structured fuzzy pairwise comparison survey is developed using these factors and distributed to transportation professionals worldwide. After collecting responses, the Fuzzy Analytic Hierarchy Process (AHP) method is employed to determine the relative importance of factors from the global, U.S., and non-U.S. perspectives. The relative importance of factors from the perspectives of owners, consultants, and contractors is also assessed. Furthermore, the SPI is developed for prioritizing projects. A case study application, involving the states adjacent to the Gulf of Mexico—Texas, Alabama, Louisiana, Florida, and Mississippi—demonstrates the applicability of the SPI to practical projects in the real world. This research will help stakeholders make informed decisions and enhance sustainability in transportation systems across all geographical contexts
Fragments of Fire: Essays on Womanhood, Family, and Environment
Get PDFFragments of Fire is a collection of non-fiction, memoir, and opinion essays that navigate themes of gender and societal issues, coming-of-age, generational dynamics, death, and the natural environment. Through an intricate blend of introspection, keen observation, and literary analysis, these essays offer insight into the transformative journey from girlhood to womanhood as experienced by a young Latina. This collection provides a resonant voice that bridges personal narrative with broader cultural and existential questions
We Shall All Be Healed
Get PDFIn this paper, I will detail the making of my University of New Orleans Graduate School of Film Production thesis film We Shall All Be Healed. I will outline the development of the of the film from the screen play and its earliest inspirations to its final cut as a short film. I will discuss the pre-production process, from casting to scheduling and finally the shoot itself. I will critically examine the challenges and mistakes made during principal photography and detailing the long post-production process. I will be assimilating the lessons learned from the courses of the UNO Film program and from the experience of making a thesis film
Tramp Stamp & Other Stories
Get PDF“Tramp Stamp & Other Stories” comes from writing fiction centered around families and relationships. Some of these stories explore life in the wake of tragedy, while others are picking up the pieces after their relationship dynamic has shifted. There is humor and absurdity mixed in with rage and sadness. I think the main characters are all women at a crossroads in their lives. How far does being a “good” wife, girlfriend, or sister get you
Primary Consolidation Settlement of South Louisiana Clay Deposits in Marsh Environment
Get PDFAccurate estimation of primary consolidation of in-situ marsh soils is inherently difficult in south Louisiana due to the soft, settlement prone soils and variable alluvial material. To investigate the accuracy of settlement analysis methods commonly utilized in local practice, estimates from numerical models were compared to the results of a settlement monitoring program at a project site during construction. Sensitivity analyses were then performed using several parameters that were used in the settlement analysis, and the results were compared to the field observations.
The disagreement of observed settlement data and settlement estimates produced with a model that did not include construction staging highlights the importance of including staged fill placement in a settlement model. Similarly, adjustment of most soil properties resulted in changes of both the magnitude and timeline of settlement, indicating the importance of the selection of appropriate model parameters
Bedeviled Beauty: My Journey Through White American Theater Institutions
Get PDFGame console: Oculus Quest
World: American Theater Institutions
Player: Minority
Place: United States
Level: “Ain’t no way.”
This thesis explores the contrast between the Westernized philosophies ingrained in my education and my identity as a Black female artist. It sheds light on the difficulties of pursuing higher education in the arts and the gaps that arise from limited exposure to culturally diverse Black resources, revealing the systemic issues in Western performance education. The paper also discusses the insights gained from my journey as a Black female artist, focusing on my thesis performance of Blood at the Root, which is specifically analyzed for its utilization of Black ritualistic methods and theories. In addition, it reflects on the beauty inherent in this personal and professional journey, emphasizing the significance of healing and growth within the context of artistic expression
Advancing Single Particle Inductively Coupled Plasma Mass Spectrometry (spICP-MS) Applications for the Detection of Nanomaterials in Complex Matrices
Get PDFAs nanotechnology expands, the pervasive use of metal nanoparticles in consumer products and electronics, as well as their multiple industrial, agricultural, and energy applications raises the demand for precise quantification and characterization. Addressing this need, single particle inductively coupled plasma mass spectrometry (spICP-MS) emerges as a powerful analytical technique with potential for a diverse range of applications. This research focuses on optimizing methods for nanoparticle (NP) detection in complex matrices like cosmetics and asphaltenes by spICP-MS. Determining the nature of metal constituents in these types of matrices is of interest due to their varying implications. Accordingly, spICP-MS can differentiate between metal-containing NPs and dissolved metals simultaneously. Analyzing complex mixtures presents a challenge in spICP-MS research due to a higher background presence, which reduces the signal-to-noise ratio and makes particle events indistinguishable. Accordingly, method parameters are exploited and data processing techniques are evaluated to overcome these challenges. In order to analyze both aqueous and hydrocarbon complex mixtures, the instrument is operated in two different modes - aqueous and hydrocarbon. In aqueous mode, a routine spICP-MS method is presented for the screening of NPs in powder-based facial cosmetics purchased from American retailers. The presence of NPs less than 100 nm was observed in all tested facial cosmetic samples suspended in water. Qualitative and semi-quantitative results for the cosmetic samples are reported and the applicability of the technique for routine measurements is demonstrated. For hydrocarbon mode, first a blank-independent, sample-based data processing approach is evaluated specifically pertaining to spICP-MS analysis of petroleum matrices. Statistical outliers are removed from the data set to create a representative background. The background data is binned into a histogram and the fit of a Gaussian and Poisson model is applied and compared to determine the appropriate calculation for the particle detection threshold (PDT). The goal is to prevent over or underestimation of the PDT and produce the most accurate size distributions and particle counts. Second, the sample data processing approach is utilized for the characterization of NPs added as co-precipitants in asphaltenes suspended in o-xylene. Particle number concentrations, ionic concentrations, size detection limits and size distributions for 56Fe and 60Ni present in eleven asphaltene samples are reported. The challenges and limitations of the three studies are addressed and future directions are discussed
Breaking Through: A Study of Educators in All-male Classrooms and the Instructional Decisions They Use to Bridge the Gender Academic Achievement Gap
Get PDFIn reviewing academic achievement gaps across United States school districts, educational research samples show deviations between males and females with males statistically outperforming females in math while females typically outperform males in reading and language arts. With strict American educational policies set in place to promote equality and equity in the classroom, research and long-term results on the impact and possible benefits of male, single-sex classrooms in the American educational system are limited. This study seeks to explore educators’ best practices for teaching male students and effective strategies to cater to their different needs. By qualitatively studying the experiences of teachers through a series of observations and interviews, the researcher gathered and analyzed the data in a multiple case study using the Multiple Intelligence theory to determine the instructional decision-making approach of teachers in single-sex classrooms. Through the triangulation of data in the cross-case thematic analysis there were two major themes that emerged: movement and Social and Emotional Learning (SEL). Three secondary but relevant themes emerged: motivation, organization, and relationships. The results further develop the deficient literature needed to understand the instructional decisions of teachers in all-male classrooms and the possible benefits, downfalls, and limitations of educators in the separation of the sexes in a classroom setting. These results may be useful in understanding methods to increase male academic success rates and to lessen the gender academic achievement gap through improved teaching techniques that will enhance male students’ engagement and understanding